Malicious PDF — malware analysis report

Static analysis result for SHA-256 249f29607d7ec05e…

MALICIOUS

PDF

79.1 KB Created: 2021-03-31 06:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad4a2e4564d63515290e9dcc4aa6a495 SHA-1: cfb24a6302c0cbe90cf93368bbf1179c6a7b6c13 SHA-256: 249f29607d7ec05ebb4a81eb73a9f52cfcff4afd9818cf87c9eef50117d13c73
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded links designed to mimic search results for academic papers, directing users to potentially malicious websites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure, and 'PDF_SEO_LINK_FARM' indicates a large number of outbound links. The ML classifier and ClamAV detection further support its malicious nature, suggesting it's used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9059

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/award?keyword=mims+medical+microbiology+pdf+download
    • https://static.s123-cdn-static.com/uploads/4455387/normal_5ff17a1902c4e.pdf
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5fc7e0ccbcab3.pdf
    • https://cdn-cms.f-static.net/uploads/4453329/normal_60621787e77ec.pdf
    • https://cdn-cms.f-static.net/uploads/4370051/normal_60312f9d3d037.pdf
    • https://static.s123-cdn-static.com/uploads/4474746/normal_5ff0d2383f786.pdf
    • http://segilajobugulof.iblogger.org/how_to_use_predictive_analysis.pdf
    • http://fukuzowi.sportsontheweb.net/guzukozigijopinosa.pdf
    • https://cdn-cms.f-static.net/uploads/4493600/normal_6025b0b19116d.pdf
    • https://static.s123-cdn-static.com/uploads/4380525/normal_5ff0d0899d027.pdf
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5fd89a1934444.pdf
    • https://cdn-cms.f-static.net/uploads/4418367/normal_60220a61a6c94.pdf
    • http://bivozebavi.iblogger.org/kano_model_template_xls.pdf
    • https://static.s123-cdn-static.com/uploads/4481408/normal_5ffef2c65d904.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fibalikirikoti.epizy.com/38591981560.pdf
    • http://pekafujojef.onlinewebshop.net/57336799000.pdf
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_07862643e3b14ee19e289c94611b487f.pdf?index=true
    • http://xipaxozudagigub.epizy.com/christmas_art_projects_for_high_school_students.pdf
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_beaa66570f2f4725811909b9e79fbcc6.pdf?index=true
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_5390f96d2f944fce9c0123f2f49e0303.pdf?index=true
    • http://woxesizefibugel.atwebpages.com/faxiseragibixifazejuluw.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b6.bin
2f32373152b86590eb5c993bf8dbb57d20fc33770b92bc1ec6b5fd985d660553		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 2828 bytes
font_01_sfnt_off000101bf.bin
bdb03aaf5ea58b2a4ac8d231696c7b34005932b5e1564ecf5a8b717e3151c7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 5812 bytes
font_02_sfnt_off00011593.bin
0bfdf06e3ac4daaad7cde641e4dff166cff4063429f45cddd60243f31d66773e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 11380 bytes

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